It is now time to reseed your lawns for the fall. This is best done in the late summer or early fall, anytime between August 15 and September 15 of the year. The rule of thumb is that that for each week grasses are seeded before Labor Day, maturation is speeded by two weeks. If you reseed after September 15 you will probably have some success, but not as much. The seed that you put out on the ground may sprout and some might even overwinter, but much of it may die from winterkill because the root systems will not be fully developed. If you are a homeowner who wants to sod an area of your lawn, you can do that until they can no longer cut it from the fields. Do remember to keep newly seeded or sodded areas watered throughout the fall and in the spring.
Good turfgrass choices for Southeast Nebraska include Turf-type tall fescue or Kentucky Bluegrass. Using seed that is 100 percent of either of these or a mix of the two types would be great choices for Nebraska. You can buy mixes of turfgrass seed, but avoid mixes that contain annual ryegrass, ‘Linn’ perennial ryegrass, or ‘Kenblue’ Kentucky Bluegrass. Make sure that the grass you buy contains less than 0.3 percent weed seed and no noxious weed seeds. We can also use Buffalograss in our lawns for a warm season grass, but warm season grasses should be plugged in June and July.
As for fertilizer applications, the fall fertilization is the most important fertilizer application for a lawn. Two applications in the fall are recommended for Kentucky bluegrass and only one is recommended for tall fescue, but one application for either species is better than none. The timing for fall fertilizer applications is Labor Day and Halloween if you do two applications and Halloween if you do only one application.
The fall is the best time to control broadleaf perennial weeds such as dandelion and clover. You can add a broadleaf herbicide to your lawn fertilizer to get a two-for-one application. It is often sold in stores as a combined product. The best herbicide choices for homeowners would be anything that contains 2,4-D or a triclopyr product for clover and ground ivy or creeping Charlie.
If you need to aerate your lawns, now is a good time to do that. You can still aerate your lawns into November if you don’t get around to it until then. Aeration is best done in the spring or the fall of the year, but it is not necessary to do it every year, if you don’t want to. Aeration is done to break up a heavy thatch layer in the grass and to reduce the compaction of the soil. The thatch layer is the layer of dead organic matter in between the grass blades and the soil line. Leaving the clippings on the lawn does not increase the thatch layer, in fact it can actually give you enough nitrogen to replace one fertilizer treatment for the year. If your thatch layer is more than one half of an inch, you may want to aerate your lawn, if it is less than that, you may decide that it is not necessary to aerate this year.